51444220 has 12 divisors (see below), whose sum is σ = 108032904. Its totient is φ = 20577680.

The previous prime is 51444199. The next prime is 51444223. The reversal of 51444220 is 2244415.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51444191 and 51444200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51444223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1286086 + ... + 1286125.

It is an arithmetic number, because the mean of its divisors is an integer number (9002742).

Almost surely, 2^51444220 is an apocalyptic number.

It is an amenable number.

51444220 is an abundant number, since it is smaller than the sum of its proper divisors (56588684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51444220 is a wasteful number, since it uses less digits than its factorization.

51444220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2572220 (or 2572218 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 51444220 is about 7172.4626175394. The cubic root of 51444220 is about 371.9165708771.

Adding to 51444220 its reverse (2244415), we get a palindrome (53688635).

The spelling of 51444220 in words is "fifty-one million, four hundred forty-four thousand, two hundred twenty".